Dangerous winter weather in the Midwest and Northeast is blamed for at least 11 deaths, thousands of canceled flights, and difficult travel on roads and highways.

A snowstorm has dumped as much as two feet of snow in parts of the Northeast. Forecasters say some areas of eastern Massachusetts could get 30 inches of snow.

Frigid temperatures are also a concern. In Burlington, Vt., Friday morning it reached 8 degrees below zero with a wind chill of 29 below. In Boston, it was 2 degrees with a wind chill of minus 20.

New York City Mayor Bill de Blasio warned residents to stay home Friday if possible.

"It's crucial that people recognize this is going to be extremely cold today," he said. "And potentially for a few more days people who can 'stay in' should."

The snow storm began in the Midwest earlier in the week where it dropped a foot of snow in parts of Michigan and Illinois.

On Thursday, airlines canceled more than 2,300 flights because of the snow and poor visibility. Early Friday morning, the airlines canceled close to 2,000 flights. The majority of canceled flights came from New York, Philadelphia, Boston, Chicago, and Washington, D.C

In New York and New Jersey the governors have declared states of emergency. Gov. Cuomo shut down three major highways outside of New York City.

From Maryland to Maine, schools and businesses are closed. An Amtrak spokeswoman said Friday that all trains on the Northeast lines were running, but on a modified schedule.

Temperatures in the Northeast are expected to rise above freezing over the weekend, before another blast of cold hits.

In Wisconsin, a record low temperature of minus 18 was set Friday morning in Green Bay. Forecasters say Sunday's NFL playoff game between the Packers and 49ers could be the coldest on record. A temperature of minus 8 is forecast.